You'll dutifully search this in the documentation, and find a pointer to what looks like the solution: Refer to the documentation to enable “Statistics Service” through the search-config.xml. Unfortunately, that documentation doesn't appear to exist currently. While we're working to update it, you can enable the statistics service by adding the following to search-config.xml on the deployment manager:

<property name="statisticsService">

<propertyField name="serviceEnabled" value="true"/>

</property>

Sync the search nodes and restart, and you should then have access to the serverStats page.

Notes & Domino 9.0.1 Feature Pack 9 (Zircon) is available on Fix Central starting today and it will also be available on Passport Advantage starting August 24th. For details on what's new in this release, refer to the Release Notice & Fix List linked below. Direct download links for this feature pack and its new templates (pubnames.ntf, pernames.ntf, and mail9.ntf) can be found via the Download Info link provided below.